New firmware

[struts]

I did google it, but it seems to have three different versions, I don't know which one is correct.
Method 1: Quick click back button tree times.
Method 2: Quick click back button five times.
Method 3: Long press back button for 10 seconds.

Thank you!

Haha, yes, it's a bit confusing with different generations of info out there.  The short answer is (3).  Scroll to the very bottom of this page and you'll find an example of the "Sound Design" you will get upon a successful reset (takes less than 10 seconds on mine).